Wool dryer balls work best on natural fibres, such as linen, cotton, hemp and bamboo. This is because synthetics cling and pull the wool fibres from the dryer balls, causing lint and in some cases static. This isn’t harmful, but can reduce the lifespan of your Wool Dryer Balls and their effectiveness.
In general, manufacturers recommend that synthetic products be hung to dry, as the heat from the dryer can break down the non-natural fibres, decreasing their longevity. Fibre-breakage that occurs during the drying cycle will also result in the release of microplastics into our water ways during subsequent washes.
We recommend you read each label as a surprising number of clothes contain non-natural or synthetic materials.
If you have blended fibre fabrics that are more of a natural fibre than not, you should not have a lint issue. But, if the fibre content is close to a 50/50 ratio, we recommend you hang dry your synthetics.